SB2026072183 - Out-of-bounds read in Linux kernel i2c driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026072183

SB2026072183 - Out-of-bounds read in Linux kernel i2c driver

Published: July 21, 2026

Security Bulletin ID SB2026072183
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-64191)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to out-of-bounds read and out-of-bounds write in stub_xfer() in the i2c-stub driver when handling an I2C_SMBUS ioctl with I2C_SMBUS_I2C_BLOCK_DATA and an invalid block length. A local user can issue a crafted ioctl request with data->block[0] greater than 32 to cause a denial of service.

The issue affects the development and test i2c-stub driver, which is not built by default and must be loaded with a chip_addr= parameter.


Remediation

Install update from vendor's website.

References